Melanie mischievously laughed not having enough fun from her brother's situation.
"D-dammit" Jeff moaned. "Are you done?"
"Why would I? We're just getting started, so better start getting used to this until you like it, because I have no reasons to leave this~"
Jeff did an infuriated expression, "do you know how weird it is to be a dude with a pussy?"
Melanie's eyes sparked, she had a new strange idea to torment her brother. "So you don't like your position huh? It seems interesting to me, maybe we should swap roles~"
"What do you mea-" Jeff couldn't finish his sentence, his head was immediately swallowed by his torso, sinking with his neck until there was nothing between his shoulders, something similar happened to Melanie, smiling while she was sucked by his brother's crotch, leaving a smooth skin space without a thing between his legs. Off course all of this was done by the younger sister, since she merged with Jeff as she stated, she had ANY control over Jeff's anatomy, no matter how weird or unrealistic it was, being capable of growing or disappearing limbs, modifying his organs and much more, but she decided to take things slowly... For a now.
Not much time passed until the body changed again, a head regrew between Jeff's shoulder, this face was more feminine, pretty and with a beautiful long blonde hair, Melanie succeeded into turning herself into the head of the body. Meanwhile another head grew between the legs, a masculine one having short black hair, with that the transformation was finished.
Melanie still in control of the body walked to the front of a mirror, taking all the clothes off. The resulting body was Melanie's head being part of Jeff's masculine and slightly muscular body since he was going to the gym, it also looked big and mature for a 16 years old, you could've guessed that was the body of a man in her twenties at least. She passed her hands through her flat masculine chest, feeling a relief since she had to carry a pair of heavy E cups tits in her original body, as her body developed quickly in her young age like Jeff, then she saw her crotch, enjoying how her brother squirmed and drooled as part of "her" body.
"What's wrong big bro? You said it was weird to you being a boy with a pussy so I wanted to the role for you~"
"This is NOT WHAT I MEA-" Jeff was silenced by his sister, interesting a finger inside him while rubbed his nose with her other hand.
"Oh God~ it really feels so gooood every time you speak~ I'll have so much fun with this, the best of both worlds! A strong masculine body with a highly sensitive vagina as my brother, what else could I wish for?" She giggled.
"Ywou stwupid bbbitch!!" Jeff tried to talk with the fingers inside his new mouth.
"Enough! I'm not going to hear you complain with this excellent body" she said even that she had fun torturing Jeff, she took the dildo and shoved it inside his mouth, while the vibrator was still inside too but now in Jeff's vaginal "throat", then she quickly put on one of Jeff's underwear to keep the dildo inside her and avoid Jeff spitting it. "Mmmph oh YES!" Melanie moaned, "this will be sooooooo gooood, I'm glad I turned into your pussy, maybe I'll go back to that position later if you can't handle being a vagina big bro~", she said while Jeff kept drooling big amounts of vaginal fluids, wetting the underwear but Melanie didn't mind.
After that whole scene, Melanie also took one of Jeff's pants and shirt and started to wear them. If you didn't look at her head you could see that it was a man, or one looking extremely similar to a woman if you wanted to pay attention to her facial features, she even had a revealing big bulge in ger underwear that could go unnoticed as a big and fat penis, but in reality it was Jeff's face between the legs, actually working as a pussy.
"We're done big bro~ but just one thing left!" She began to type on the computer, she changed reality to make everyone forget about Jeff and just treat him as a casual talking vagina, but they would know again who Jeff is if Melanie decided to turn him into the head of the body again. That was the only change she made as she wanted to have fun with people trying to guess if she was a man or a woman, but then confusing then even more when she revealed her pussy which they would think it was a dick between her pants, she clicked enter and the reality was changed.
"N-now let's see what else we... Mmmph oh! Can do~" Melanie said moaning, resisting to the dildo and vibrator inside her, while Jeff felt thing but worse with his mouth stuffed of sex toys.